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Family name Kler (كلير , Kler , Клер ) , all over the world, is quite a rare last name. The last name Kler is characteristic of Luxembourg, where it is quite a rare surname, Bulgaria, where it is a rare surname, and Netherlands. Not in comparison with a country's population, it is the most numerous in India, Argentina, and the United States. Likewise, Kler is the forename as well as the last name.